Looks like the gearbox is a copy or made by LDT which made a gearbox for gel blasters. Check youtube for videos on the LDT ATM gearbox. The only changes I can see is the change to the mag detection and probably a slightly different BB feed. I like the look of it as an idea and I've ordered one. I'd be interested to see if it can be swapped into other AEG shells to make more models that currently aren't for sale. I have E&C MCX and it would be good to have this engine inside that shell.